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<li class="navelem"><a class="el" href="dir_460afd45d0ec637b1427e0e06a6fbcf7.html">net_flow</a></li><li class="navelem"><a class="el" href="dir_6dd0f5e913f2b13fdf6025047ac045ce.html">detail</a></li>  </ul>
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  <div class="headertitle"><div class="title">port_space.cpp</div></div>
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<a href="port__space_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#include &quot;<a class="code" href="port__space_8hpp.html">flow/net_flow/detail/port_space.hpp</a>&quot;</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="preprocessor">#include &quot;<a class="code" href="util_2util_8hpp.html">flow/util/util.hpp</a>&quot;</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#include &quot;flow/error/error.hpp&quot;</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &lt;limits&gt;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span> </div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceflow_1_1net__flow.html">flow::net_flow</a></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span>{</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span> </div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="comment">// Type checks.</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="keyword">static_assert</span>(<span class="keyword">sizeof</span>(size_t) &gt; <span class="keyword">sizeof</span>(<a class="code hl_typedef" href="namespaceflow_1_1net__flow.html#a079d8cd87a68d1c5f04c6bce71f0061d">flow_port_t</a>),</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span>              <span class="stringliteral">&quot;@todo Investigate why this is required.  As of this writing I do not recall off-hand.&quot;</span>);</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span> </div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment">// Static initializations.</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"><a class="line" href="namespaceflow_1_1net__flow.html#a9dd0c9d8de00fab78d8b0a3f50dad2a9">   33</a></span><span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow_1_1net__flow.html#a079d8cd87a68d1c5f04c6bce71f0061d">flow_port_t</a> <a class="code hl_variable" href="namespaceflow_1_1net__flow.html#a9dd0c9d8de00fab78d8b0a3f50dad2a9">S_PORT_ANY</a> = 0; <span class="comment">// Not in Port_space, but the numbering must fit within Port_space&#39;s.</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment">// Avoid overflow via above static assertion.</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="keyword">const</span> <span class="keywordtype">size_t</span> <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#af0c60ec4732021d52a19e5d2f6dc8b35">Port_space::S_NUM_PORTS</a> = size_t(std::numeric_limits&lt;flow_port_t&gt;::max()) + 1;</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="keyword">const</span> <span class="keywordtype">size_t</span> <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ad93c0b6f23be37efe0f96ab066ff9bf8">Port_space::S_NUM_SERVICE_PORTS</a> = S_NUM_PORTS / 2 - 1;</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment">// -1 for S_PORT_ANY.  @todo I now have no idea what that comment means.  Figure it out....</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="keyword">const</span> <span class="keywordtype">size_t</span> <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a06fb009aafc77f75241f721734fe3cc4">Port_space::S_NUM_EPHEMERAL_PORTS</a> = S_NUM_PORTS - S_NUM_SERVICE_PORTS - 1;</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="keyword">const</span> <span class="keywordtype">size_t</span> <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a0bdaf744b7089027c8d952b67d1f9cc0">Port_space::S_MAX_RECENT_EPHEMERAL_PORTS</a> = S_NUM_EPHEMERAL_PORTS / 32;</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow_1_1net__flow.html#a079d8cd87a68d1c5f04c6bce71f0061d">flow_port_t</a> <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a6d07833521960b2f90806bfa7728cfd8">Port_space::S_FIRST_SERVICE_PORT</a> = 1;</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow_1_1net__flow.html#a079d8cd87a68d1c5f04c6bce71f0061d">flow_port_t</a> <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ab9a614b67638cbd9526eb82033a53352">Port_space::S_FIRST_EPHEMERAL_PORT</a> = S_FIRST_SERVICE_PORT + S_NUM_SERVICE_PORTS;</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span> </div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="comment">// Implementations.</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span> </div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Port__space.html#ad02a2c57aa6854659621af98b64d3638">   45</a></span><a class="code hl_function" href="classflow_1_1net__flow_1_1Port__space.html#ad02a2c57aa6854659621af98b64d3638">Port_space::Port_space</a>(<a class="code hl_class" href="classflow_1_1log_1_1Logger.html">log::Logger</a>* logger_ptr) :</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span>  log::Log_context(logger_ptr, <a class="code hl_enumeration" href="namespaceflow.html#a3938730ab4b89daf13d027a5f620e7ce">Flow_log_component</a>::S_NET_FLOW),</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span>  <span class="comment">// Set the bit fields to their permanent widths.</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span>  m_service_ports(S_NUM_SERVICE_PORTS),</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span>  m_ephemeral_ports(S_NUM_EPHEMERAL_PORTS),</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span>  m_ephemeral_and_recent_ephemeral_ports(S_NUM_EPHEMERAL_PORTS),</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span>  m_rnd_generator(<a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#af4690f25a42ebb61561f91c9187bcc30">Random_generator</a>::result_type(util::<a class="code hl_function" href="namespaceflow_1_1util.html#ad92ad411feccf73908abe6ed130d48f5">time_since_posix_epoch</a>().count()))</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span>{</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span>  <span class="comment">// All 1s = all ports available.</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a1f8e8e52bf4ec90e0b13d9159c403eae">m_service_ports</a>.set();</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#aeafab53f020093121f5e57f1e692a9df">m_ephemeral_ports</a>.set();</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#abc455d9e1b00886f7985c7b5fd115862">m_ephemeral_and_recent_ephemeral_ports</a>.set();</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span> </div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span>  <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Port_space [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;] created; &quot;</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span>                <span class="stringliteral">&quot;port PORT_ANY [&quot;</span> &lt;&lt; <a class="code hl_variable" href="namespaceflow_1_1net__flow.html#a9dd0c9d8de00fab78d8b0a3f50dad2a9">S_PORT_ANY</a> &lt;&lt; <span class="stringliteral">&quot;]; service ports [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a6d07833521960b2f90806bfa7728cfd8">S_FIRST_SERVICE_PORT</a> &lt;&lt; <span class="stringliteral">&quot;, &quot;</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span>                &lt;&lt; (<a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a6d07833521960b2f90806bfa7728cfd8">S_FIRST_SERVICE_PORT</a>)</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span>                    + <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ad93c0b6f23be37efe0f96ab066ff9bf8">S_NUM_SERVICE_PORTS</a>) - 1) &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span>                <span class="stringliteral">&quot;ephemeral ports [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ab9a614b67638cbd9526eb82033a53352">S_FIRST_EPHEMERAL_PORT</a> &lt;&lt; <span class="stringliteral">&quot;, &quot;</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span>                &lt;&lt; (<a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ab9a614b67638cbd9526eb82033a53352">S_FIRST_EPHEMERAL_PORT</a>)</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span>                    + <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a06fb009aafc77f75241f721734fe3cc4">S_NUM_EPHEMERAL_PORTS</a>) - 1) &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span>} <span class="comment">// Port_space::Port_space()</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span> </div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Port__space.html#ac43e4303aac2bde697b99bf03901ec85">   67</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Port__space.html#ac43e4303aac2bde697b99bf03901ec85">Port_space::is_service_port</a>(<a class="code hl_typedef" href="namespaceflow_1_1net__flow.html#a079d8cd87a68d1c5f04c6bce71f0061d">flow_port_t</a> port) <span class="comment">// Static.</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span>{</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span>  <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceflow_1_1util.html#a024ddda9acb2b66f2a1b35cdb0c016aa">util::in_closed_open_range</a>(<a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a6d07833521960b2f90806bfa7728cfd8">S_FIRST_SERVICE_PORT</a>),</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span>                                    <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(port),</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span>                                    <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a6d07833521960b2f90806bfa7728cfd8">S_FIRST_SERVICE_PORT</a>)</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span>                                      + <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ad93c0b6f23be37efe0f96ab066ff9bf8">S_NUM_SERVICE_PORTS</a>));</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span>}</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span> </div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Port__space.html#a1168841ecd09d3187f9803eac2b8b703">   75</a></span><a class="code hl_typedef" href="namespaceflow_1_1net__flow.html#a079d8cd87a68d1c5f04c6bce71f0061d">flow_port_t</a> <a class="code hl_function" href="classflow_1_1net__flow_1_1Port__space.html#a1168841ecd09d3187f9803eac2b8b703">Port_space::reserve_port</a>(<a class="code hl_typedef" href="namespaceflow_1_1net__flow.html#a079d8cd87a68d1c5f04c6bce71f0061d">flow_port_t</a> port, <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a>* err_code)</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span>{</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span>  <span class="keywordflow">if</span> (port == <a class="code hl_variable" href="namespaceflow_1_1net__flow.html#a9dd0c9d8de00fab78d8b0a3f50dad2a9">S_PORT_ANY</a>)</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span>  {</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span>    <span class="keywordflow">return</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Port__space.html#a65dbe99c7c4433e6c090f26c92ab3f78">reserve_ephemeral_port</a>(err_code);</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span>  }</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span> </div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>  <span class="comment">// Explicitly disallow reserving specific ephemeral ports.</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span>  <span class="keywordflow">if</span> (!<a class="code hl_function" href="classflow_1_1net__flow_1_1Port__space.html#ac43e4303aac2bde697b99bf03901ec85">is_service_port</a>(port))</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span>  {</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span>    <a class="code hl_define" href="error_2error_8hpp.html#ab6b8ed79012c994cfc381e0b92c066fd">FLOW_ERROR_EMIT_ERROR</a>(<a class="code hl_enumvalue" href="namespaceflow_1_1net__flow_1_1error.html#a18e13de77b119ea0f2be411490859482abb79e941df00b67a8631a9361ee5a4d1">error::Code::S_INVALID_SERVICE_PORT_NUMBER</a>);</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>    <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Port was [&quot;</span> &lt;&lt; port &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span>    <span class="keywordflow">return</span> <a class="code hl_variable" href="namespaceflow_1_1net__flow.html#a9dd0c9d8de00fab78d8b0a3f50dad2a9">S_PORT_ANY</a>;</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span>  }</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span> </div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span>  <span class="comment">// Bits are indexed from 0, service ports from S_FIRST_SERVICE_PORT.</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> port_bit_idx = port - <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a6d07833521960b2f90806bfa7728cfd8">S_FIRST_SERVICE_PORT</a>;</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span> </div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span>  <span class="comment">// Ensure not trying to reserve an already reserved service port.</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span>  <span class="keywordflow">if</span> (!<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a1f8e8e52bf4ec90e0b13d9159c403eae">m_service_ports</a>.test(port_bit_idx))</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span>  {</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span>    <a class="code hl_define" href="error_2error_8hpp.html#ab6b8ed79012c994cfc381e0b92c066fd">FLOW_ERROR_EMIT_ERROR</a>(<a class="code hl_enumvalue" href="namespaceflow_1_1net__flow_1_1error.html#a18e13de77b119ea0f2be411490859482a2c42b01b60ebe4834e9be3933ce94cb6">error::Code::S_PORT_TAKEN</a>);</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span>    <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Port was [&quot;</span> &lt;&lt; port &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span>    <span class="keywordflow">return</span> <a class="code hl_variable" href="namespaceflow_1_1net__flow.html#a9dd0c9d8de00fab78d8b0a3f50dad2a9">S_PORT_ANY</a>;</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span>  }</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span> </div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span>  <span class="comment">// Record as reserved.</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a1f8e8e52bf4ec90e0b13d9159c403eae">m_service_ports</a>.set(port_bit_idx, <span class="keyword">false</span>);</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span> </div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span>  err_code-&gt;clear();</div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span>  <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Flow service port [&quot;</span> &lt;&lt; port &lt;&lt; <span class="stringliteral">&quot;] reserved.&quot;</span>);</div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span>  <span class="keywordflow">return</span> port;</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span>} <span class="comment">// Port_space::reserve_port()</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span> </div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Port__space.html#a65dbe99c7c4433e6c090f26c92ab3f78">  112</a></span><a class="code hl_typedef" href="namespaceflow_1_1net__flow.html#a079d8cd87a68d1c5f04c6bce71f0061d">flow_port_t</a> <a class="code hl_function" href="classflow_1_1net__flow_1_1Port__space.html#a65dbe99c7c4433e6c090f26c92ab3f78">Port_space::reserve_ephemeral_port</a>(<a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a>* err_code)</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span>{</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span>  <a class="code hl_typedef" href="namespaceflow_1_1net__flow.html#a079d8cd87a68d1c5f04c6bce71f0061d">flow_port_t</a> port = <a class="code hl_variable" href="namespaceflow_1_1net__flow.html#a9dd0c9d8de00fab78d8b0a3f50dad2a9">S_PORT_ANY</a>; <span class="comment">// Failure result.</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span> </div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span>  <span class="comment">// Find a random available and not recently used ephemeral port.</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>  <span class="keywordtype">size_t</span> port_bit_idx = <a class="code hl_function" href="classflow_1_1net__flow_1_1Port__space.html#ad5a6a34a24c95364bb8348e5030d955b">find_available_port_bit_idx</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#abc455d9e1b00886f7985c7b5fd115862">m_ephemeral_and_recent_ephemeral_ports</a>);</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span>  <span class="keywordflow">if</span> (port_bit_idx != Bit_set::npos)</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span>  {</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span>    <span class="comment">// Found (typical).  Just reserve that port then.</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span> </div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span>    <span class="comment">// Note: This shouldn&#39;t overflow.</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span>    assert((<a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(port_bit_idx) + <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ab9a614b67638cbd9526eb82033a53352">S_FIRST_EPHEMERAL_PORT</a>))</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span>           <span class="comment">// Subtlety: The following exceeds domain of flow_port_t but not of flow_port_sans_overflow_t.</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span>           &lt; (<a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ab9a614b67638cbd9526eb82033a53352">S_FIRST_EPHEMERAL_PORT</a>) + <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a06fb009aafc77f75241f721734fe3cc4">S_NUM_EPHEMERAL_PORTS</a>)));</div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span>    port = port_bit_idx + <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ab9a614b67638cbd9526eb82033a53352">S_FIRST_EPHEMERAL_PORT</a>;</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span>    <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#aeafab53f020093121f5e57f1e692a9df">m_ephemeral_ports</a>.set(port_bit_idx, <span class="keyword">false</span>);</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span> </div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span>    <span class="comment">// Port not being returned =&gt; no effect on m_recent_ephemeral_ports.</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span> </div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span>    <span class="comment">/* Maintain invariant: 0 in m_ephemeral_ports =&gt; 0 in m_ephemeral_and_recent_ephemeral_ports.</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span><span class="comment">     * No effect on m_recent_ephemeral_ports =&gt; no effect on other invariant. */</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span>    <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#abc455d9e1b00886f7985c7b5fd115862">m_ephemeral_and_recent_ephemeral_ports</a>.set(port_bit_idx, <span class="keyword">false</span>);</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span>  }</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span>  <span class="keywordflow">else</span> <span class="comment">// if (port_bit_idx == Bit_set::npos) &amp;&amp;</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span>    <span class="keywordflow">if</span> (!<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ae401e02d49ce557bbc5474e049eb5455">m_recent_ephemeral_ports</a>.empty())</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span>  {</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span>    <span class="comment">// No not-recently-used available ports... but there are still some recently-used availables ones left.</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span> </div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span>    <span class="comment">// Use the top of the queue: the port least recently added to the FIFO.</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span>    port = <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ae401e02d49ce557bbc5474e049eb5455">m_recent_ephemeral_ports</a>.front();</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span>    <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ae401e02d49ce557bbc5474e049eb5455">m_recent_ephemeral_ports</a>.pop();</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span>    <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;Ran out of non-recently used and available NetFlow ports; &quot;</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span>                  <span class="stringliteral">&quot;reserving oldest recently used available NetFlow port [&quot;</span> &lt;&lt; port &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span> </div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span>    <span class="comment">/* Port not being returned =&gt; no effect on m_recent_ephemeral_ports.</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span><span class="comment">     * Port changing from recently-used-but available to reserved =&gt; still should be 0 to maintain invariant. */</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span> </div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span>    <span class="comment">// Reserve port (and sanity-check some stuff).</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span>    port_bit_idx = port - <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ab9a614b67638cbd9526eb82033a53352">S_FIRST_EPHEMERAL_PORT</a>;</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span>    <span class="comment">// If it was in the FIFO, it should be 0 in this guy (invariant).</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span>    assert(!<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#abc455d9e1b00886f7985c7b5fd115862">m_ephemeral_and_recent_ephemeral_ports</a>.test(port_bit_idx));</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span>    <span class="comment">// If it was in the FIFO, it was available, so should not be 0 in this guy.</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span>    assert(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#aeafab53f020093121f5e57f1e692a9df">m_ephemeral_ports</a>.test(port_bit_idx));</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span>    <span class="comment">// Reserve.</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span>    <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#aeafab53f020093121f5e57f1e692a9df">m_ephemeral_ports</a>.set(port_bit_idx, <span class="keyword">false</span>);</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span>  }</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span>  <span class="comment">// else simply no ephemeral ports available.</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span> </div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span>  <span class="keywordflow">if</span> (port == <a class="code hl_variable" href="namespaceflow_1_1net__flow.html#a9dd0c9d8de00fab78d8b0a3f50dad2a9">S_PORT_ANY</a>)</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span>  {</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span>    <a class="code hl_define" href="error_2error_8hpp.html#ab6b8ed79012c994cfc381e0b92c066fd">FLOW_ERROR_EMIT_ERROR</a>(<a class="code hl_enumvalue" href="namespaceflow_1_1net__flow_1_1error.html#a18e13de77b119ea0f2be411490859482a1975df7ed76c42660cbdc6039d5c70c5">error::Code::S_OUT_OF_PORTS</a>);</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span>  }</div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span>  <span class="keywordflow">else</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span>  {</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span>    err_code-&gt;clear();</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span>    <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;NetFlow ephemeral port [&quot;</span> &lt;&lt; port &lt;&lt; <span class="stringliteral">&quot;] reserved.&quot;</span>);</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span>  }</div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span> </div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Available ephemeral port count [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#aeafab53f020093121f5e57f1e692a9df">m_ephemeral_ports</a>.count() &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span>                 <span class="stringliteral">&quot;recently used ephemeral port count [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ae401e02d49ce557bbc5474e049eb5455">m_recent_ephemeral_ports</a>.size() &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span>  <span class="keywordflow">return</span> port;</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span>} <span class="comment">// Port_space::reserve_ephemeral_port()</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span> </div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Port__space.html#a9fe1be917ff7584ff587b5da5967127a">  175</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Port__space.html#a9fe1be917ff7584ff587b5da5967127a">Port_space::return_port</a>(<a class="code hl_typedef" href="namespaceflow_1_1net__flow.html#a079d8cd87a68d1c5f04c6bce71f0061d">flow_port_t</a> port, <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a>* err_code)</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span>{</div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span>  <span class="comment">// Check if it&#39;s a service port.</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span>  <span class="keywordflow">if</span> (<a class="code hl_function" href="classflow_1_1net__flow_1_1Port__space.html#ac43e4303aac2bde697b99bf03901ec85">is_service_port</a>(port))</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span>  {</div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span>    <span class="comment">// Straightforward; just return it if it&#39;s really reserved.</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span>    assert(port &gt;= <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a6d07833521960b2f90806bfa7728cfd8">S_FIRST_SERVICE_PORT</a>);</div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span>    <span class="keyword">const</span> <span class="keywordtype">size_t</span> port_bit_idx = port - <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a6d07833521960b2f90806bfa7728cfd8">S_FIRST_SERVICE_PORT</a>;</div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span> </div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span>    <span class="comment">// Check for &quot;double-return.&quot;</span></div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span>    <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a1f8e8e52bf4ec90e0b13d9159c403eae">m_service_ports</a>.test(port_bit_idx))</div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span>    {</div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span>      <a class="code hl_define" href="error_2error_8hpp.html#ab6b8ed79012c994cfc381e0b92c066fd">FLOW_ERROR_EMIT_ERROR</a>(<a class="code hl_enumvalue" href="namespaceflow_1_1net__flow_1_1error.html#a18e13de77b119ea0f2be411490859482a0eac39cc62ef841927a2f69a3c04db4e">error::Code::S_INTERNAL_ERROR_PORT_NOT_TAKEN</a>);</div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span>      <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Port was [&quot;</span> &lt;&lt; port &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span>      <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span>    }</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span>    <span class="comment">// else</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span>    <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a1f8e8e52bf4ec90e0b13d9159c403eae">m_service_ports</a>.set(port_bit_idx, <span class="keyword">true</span>);</div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span> </div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span>    err_code-&gt;clear();</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span>    <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;NetFlow service port [&quot;</span> &lt;&lt; port &lt;&lt; <span class="stringliteral">&quot;] returned.&quot;</span>);</div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span>  } <span class="comment">// if (service port)</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span> </div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span>  <span class="comment">// Check if it&#39;s an ephemeral port.</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span>  <span class="keywordflow">if</span> (<a class="code hl_function" href="namespaceflow_1_1util.html#a024ddda9acb2b66f2a1b35cdb0c016aa">util::in_closed_open_range</a>(<a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ab9a614b67638cbd9526eb82033a53352">S_FIRST_EPHEMERAL_PORT</a>),</div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span>                                 <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(port),</div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span>                                 <span class="comment">// Subtlety: The following would probably overflow without the conversion.</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span>                                 <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ab9a614b67638cbd9526eb82033a53352">S_FIRST_EPHEMERAL_PORT</a>)</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span>                                   + <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow_port_sans_overflow_t</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a06fb009aafc77f75241f721734fe3cc4">S_NUM_EPHEMERAL_PORTS</a>)))</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span>  {</div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span>    assert(port &gt;= <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ab9a614b67638cbd9526eb82033a53352">S_FIRST_EPHEMERAL_PORT</a>);</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span>    <span class="keyword">const</span> <span class="keywordtype">size_t</span> port_bit_idx = port - <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ab9a614b67638cbd9526eb82033a53352">S_FIRST_EPHEMERAL_PORT</a>;</div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span> </div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span>    <span class="comment">// Check for &quot;double-return.&quot;</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span>    <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#aeafab53f020093121f5e57f1e692a9df">m_ephemeral_ports</a>.test(port_bit_idx))</div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span>    {</div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span>      <a class="code hl_define" href="error_2error_8hpp.html#ab6b8ed79012c994cfc381e0b92c066fd">FLOW_ERROR_EMIT_ERROR</a>(<a class="code hl_enumvalue" href="namespaceflow_1_1net__flow_1_1error.html#a18e13de77b119ea0f2be411490859482a0eac39cc62ef841927a2f69a3c04db4e">error::Code::S_INTERNAL_ERROR_PORT_NOT_TAKEN</a>);</div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno">  214</span>      <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Port was [&quot;</span> &lt;&lt; port &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span>      <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span>    }</div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span>    <span class="comment">// else</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span> </div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span>    <span class="comment">// Sanity-check invariant (0 in m_ephemeral_ports =&gt; 0 in m_ephemeral_and_recent_ephemeral_ports).</span></div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span>    assert(!<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#abc455d9e1b00886f7985c7b5fd115862">m_ephemeral_and_recent_ephemeral_ports</a>.test(port_bit_idx));</div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span> </div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span>    <span class="comment">// Unreserve.</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span>    <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#aeafab53f020093121f5e57f1e692a9df">m_ephemeral_ports</a>.set(port_bit_idx, <span class="keyword">true</span>);</div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span> </div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno">  225</span>    <span class="comment">// As promised, any newly returned port goes to the back of the queue (most recent).</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno">  226</span>    <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ae401e02d49ce557bbc5474e049eb5455">m_recent_ephemeral_ports</a>.push(port);</div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno">  227</span> </div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span>    <span class="comment">// If we&#39;ve thus exceeded max size of queue, free the least recent &quot;recent&quot; port of &quot;recent&quot; status.</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span>    <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ae401e02d49ce557bbc5474e049eb5455">m_recent_ephemeral_ports</a>.size() &gt; <span class="keywordtype">size_t</span>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a0bdaf744b7089027c8d952b67d1f9cc0">S_MAX_RECENT_EPHEMERAL_PORTS</a>))</div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span>    {</div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span>      <span class="comment">// Front of queue = oldest.</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span>      <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow_1_1net__flow.html#a079d8cd87a68d1c5f04c6bce71f0061d">flow_port_t</a> port = <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ae401e02d49ce557bbc5474e049eb5455">m_recent_ephemeral_ports</a>.front();</div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno">  233</span>      assert(port &gt;= <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ab9a614b67638cbd9526eb82033a53352">S_FIRST_EPHEMERAL_PORT</a>);</div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span>      <span class="keyword">const</span> <span class="keywordtype">size_t</span> port_bit_idx = port - <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ab9a614b67638cbd9526eb82033a53352">S_FIRST_EPHEMERAL_PORT</a>;</div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span>      <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ae401e02d49ce557bbc5474e049eb5455">m_recent_ephemeral_ports</a>.pop();</div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span> </div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno">  237</span>      <span class="comment">// Sanity-check we always clip the queue right after the maximum is exceeded.</span></div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno">  238</span>      assert(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ae401e02d49ce557bbc5474e049eb5455">m_recent_ephemeral_ports</a>.size() == <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#a0bdaf744b7089027c8d952b67d1f9cc0">S_MAX_RECENT_EPHEMERAL_PORTS</a>);</div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno">  239</span>      <span class="comment">// Sanity-check: recently used port we&#39;re evicting was indeed not reserved.</span></div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno">  240</span>      assert(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#aeafab53f020093121f5e57f1e692a9df">m_ephemeral_ports</a>.test(port_bit_idx));</div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno">  241</span>      <span class="comment">// Sanity-check invariant: port was in m_recent_ephemeral_ports =&gt; bit is 0 in this structure.</span></div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno">  242</span>      assert(!<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#abc455d9e1b00886f7985c7b5fd115862">m_ephemeral_and_recent_ephemeral_ports</a>.test(port_bit_idx));</div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno">  243</span> </div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno">  244</span>      <span class="comment">// Maintain invariant: all other ports are 1 in m_ephemeral_and_recent_ephemeral_ports.</span></div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno">  245</span>      <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#abc455d9e1b00886f7985c7b5fd115862">m_ephemeral_and_recent_ephemeral_ports</a>.set(port_bit_idx, <span class="keyword">true</span>);</div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno">  246</span>    }</div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno">  247</span> </div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno">  248</span>    err_code-&gt;clear();</div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span>    <a class="code hl_define" href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a>(<span class="stringliteral">&quot;NetFlow ephemeral port [&quot;</span> &lt;&lt; port &lt;&lt; <span class="stringliteral">&quot;] returned.&quot;</span>);</div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno">  250</span>    <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Available ephemeral port count [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#aeafab53f020093121f5e57f1e692a9df">m_ephemeral_ports</a>.count() &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno">  251</span>                   <span class="stringliteral">&quot;recently used ephemeral port count [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ae401e02d49ce557bbc5474e049eb5455">m_recent_ephemeral_ports</a>.size() &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno">  252</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno">  253</span>  } <span class="comment">// else if (ephemeral port)</span></div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno">  254</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno">  255</span> </div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno">  256</span>  <span class="comment">// Invalid port number =&gt; it was never reserved.  Yeah.  Am I wrong?  I am not.</span></div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno">  257</span>  <a class="code hl_define" href="error_2error_8hpp.html#ab6b8ed79012c994cfc381e0b92c066fd">FLOW_ERROR_EMIT_ERROR</a>(<a class="code hl_enumvalue" href="namespaceflow_1_1net__flow_1_1error.html#a18e13de77b119ea0f2be411490859482a0eac39cc62ef841927a2f69a3c04db4e">error::Code::S_INTERNAL_ERROR_PORT_NOT_TAKEN</a>);</div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno">  258</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Port was [&quot;</span> &lt;&lt; port &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno">  259</span>} <span class="comment">// Port_space::return_port()</span></div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno">  260</span> </div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Port__space.html#ad5a6a34a24c95364bb8348e5030d955b">  261</a></span><span class="keywordtype">size_t</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Port__space.html#ad5a6a34a24c95364bb8348e5030d955b">Port_space::find_available_port_bit_idx</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Port__space.html#a729dc0add1c98ebde5b3549d3ec132e2">Bit_set</a>&amp; ports)</div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno">  262</span>{</div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno">  263</span>  <span class="keyword">using </span>boost::random::uniform_int_distribution;</div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno">  264</span> </div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno">  265</span>  <span class="comment">// Pick a random bit in bit field.</span></div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno">  266</span>  uniform_int_distribution&lt;size_t&gt; range(0, ports.size() - 1);</div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno">  267</span>  <span class="keywordtype">size_t</span> port_bit_idx = range(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Port__space.html#ae4714945b23e588b1554240fa590560a">m_rnd_generator</a>);</div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno">  268</span> </div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno">  269</span>  <span class="comment">// If that bit is 0, go right until you find a 1.</span></div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno">  270</span>  <span class="keywordflow">if</span> (!ports.test(port_bit_idx))</div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno">  271</span>  {</div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno">  272</span>    port_bit_idx = ports.find_next(port_bit_idx);</div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno">  273</span>    <span class="comment">// If no 1s to the right, wrap around at the beginning and find the first 1.</span></div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno">  274</span>    <span class="keywordflow">if</span> (port_bit_idx == Bit_set::npos)</div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno">  275</span>    {</div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno">  276</span>      port_bit_idx = ports.find_first();</div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno">  277</span>      <span class="comment">// And if still no 1s found, then so be it (return npos).</span></div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno">  278</span>    }</div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno">  279</span>  }</div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno">  280</span>  <span class="keywordflow">return</span> port_bit_idx;</div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno">  281</span>} <span class="comment">// Port_space::find_available_port_bit_idx</span></div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno">  282</span> </div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno">  283</span>} <span class="comment">// namespace flow::net_flow</span></div>
<div class="ttc" id="aclassflow_1_1log_1_1Logger_html"><div class="ttname"><a href="classflow_1_1log_1_1Logger.html">flow::log::Logger</a></div><div class="ttdoc">Interface that the user should implement, passing the implementing Logger into logging classes (Flow'...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01280">log.hpp:1284</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_a06fb009aafc77f75241f721734fe3cc4"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#a06fb009aafc77f75241f721734fe3cc4">flow::net_flow::Port_space::S_NUM_EPHEMERAL_PORTS</a></div><div class="ttdeci">static const size_t S_NUM_EPHEMERAL_PORTS</div><div class="ttdoc">Total number of &quot;ephemeral&quot; ports (ones reserved at random with reserve_ephemeral_port()).</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8hpp_source.html#l00105">port_space.hpp:105</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_a0bdaf744b7089027c8d952b67d1f9cc0"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#a0bdaf744b7089027c8d952b67d1f9cc0">flow::net_flow::Port_space::S_MAX_RECENT_EPHEMERAL_PORTS</a></div><div class="ttdeci">static const size_t S_MAX_RECENT_EPHEMERAL_PORTS</div><div class="ttdoc">The maximum size of m_recent_ephemeral_ports.</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8hpp_source.html#l00205">port_space.hpp:205</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_a1168841ecd09d3187f9803eac2b8b703"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#a1168841ecd09d3187f9803eac2b8b703">flow::net_flow::Port_space::reserve_port</a></div><div class="ttdeci">flow_port_t reserve_port(flow_port_t port, Error_code *err_code)</div><div class="ttdoc">Reserve the specified service port, or reserve_ephemeral_port() if the specified port is S_PORT_ANY.</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8cpp_source.html#l00075">port_space.cpp:75</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_a1f8e8e52bf4ec90e0b13d9159c403eae"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#a1f8e8e52bf4ec90e0b13d9159c403eae">flow::net_flow::Port_space::m_service_ports</a></div><div class="ttdeci">Bit_set m_service_ports</div><div class="ttdoc">Current service port set.</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8hpp_source.html#l00213">port_space.hpp:213</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_a65dbe99c7c4433e6c090f26c92ab3f78"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#a65dbe99c7c4433e6c090f26c92ab3f78">flow::net_flow::Port_space::reserve_ephemeral_port</a></div><div class="ttdeci">flow_port_t reserve_ephemeral_port(Error_code *err_code)</div><div class="ttdoc">Reserve a randomly chosen available ephemeral port.</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8cpp_source.html#l00112">port_space.cpp:112</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_a6d07833521960b2f90806bfa7728cfd8"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#a6d07833521960b2f90806bfa7728cfd8">flow::net_flow::Port_space::S_FIRST_SERVICE_PORT</a></div><div class="ttdeci">static const flow_port_t S_FIRST_SERVICE_PORT</div><div class="ttdoc">The port number of the lowest service port.</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8hpp_source.html#l00108">port_space.hpp:108</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_a729dc0add1c98ebde5b3549d3ec132e2"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#a729dc0add1c98ebde5b3549d3ec132e2">flow::net_flow::Port_space::Bit_set</a></div><div class="ttdeci">boost::dynamic_bitset&lt;&gt; Bit_set</div><div class="ttdoc">Short-hand for bit set of arbitary length, representing a port set (each bit is a port; 1 open,...</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8hpp_source.html#l00164">port_space.hpp:164</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_a9fe1be917ff7584ff587b5da5967127a"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#a9fe1be917ff7584ff587b5da5967127a">flow::net_flow::Port_space::return_port</a></div><div class="ttdeci">void return_port(flow_port_t port, Error_code *err_code)</div><div class="ttdoc">Return a previously reserved port (of any type).</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8cpp_source.html#l00175">port_space.cpp:175</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_ab9a614b67638cbd9526eb82033a53352"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#ab9a614b67638cbd9526eb82033a53352">flow::net_flow::Port_space::S_FIRST_EPHEMERAL_PORT</a></div><div class="ttdeci">static const flow_port_t S_FIRST_EPHEMERAL_PORT</div><div class="ttdoc">The port number of the lowest ephemeral port.</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8hpp_source.html#l00111">port_space.hpp:111</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_abc455d9e1b00886f7985c7b5fd115862"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#abc455d9e1b00886f7985c7b5fd115862">flow::net_flow::Port_space::m_ephemeral_and_recent_ephemeral_ports</a></div><div class="ttdeci">Bit_set m_ephemeral_and_recent_ephemeral_ports</div><div class="ttdoc">Set representing the union of the set of current reserved ephemeral ports and the set of the last up-...</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8hpp_source.html#l00234">port_space.hpp:234</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_ac43e4303aac2bde697b99bf03901ec85"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#ac43e4303aac2bde697b99bf03901ec85">flow::net_flow::Port_space::is_service_port</a></div><div class="ttdeci">static bool is_service_port(flow_port_t port)</div><div class="ttdoc">Returns true if and only if the given port is a service port (as opposed to ephemeral or S_PORT_ANY).</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8cpp_source.html#l00067">port_space.cpp:67</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_ad02a2c57aa6854659621af98b64d3638"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#ad02a2c57aa6854659621af98b64d3638">flow::net_flow::Port_space::Port_space</a></div><div class="ttdeci">Port_space(log::Logger *logger)</div><div class="ttdoc">Constructs the Port_space with all ports available.</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8cpp_source.html#l00045">port_space.cpp:45</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_ad5a6a34a24c95364bb8348e5030d955b"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#ad5a6a34a24c95364bb8348e5030d955b">flow::net_flow::Port_space::find_available_port_bit_idx</a></div><div class="ttdeci">size_t find_available_port_bit_idx(const Bit_set &amp;ports)</div><div class="ttdoc">Helper method that, given a reference to a bit set representing available ports (1 available,...</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8cpp_source.html#l00261">port_space.cpp:261</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_ad93c0b6f23be37efe0f96ab066ff9bf8"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#ad93c0b6f23be37efe0f96ab066ff9bf8">flow::net_flow::Port_space::S_NUM_SERVICE_PORTS</a></div><div class="ttdeci">static const size_t S_NUM_SERVICE_PORTS</div><div class="ttdoc">Total number of &quot;service&quot; ports (ones that can be reserved by number with reserve_port()).</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8hpp_source.html#l00102">port_space.hpp:102</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_ae401e02d49ce557bbc5474e049eb5455"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#ae401e02d49ce557bbc5474e049eb5455">flow::net_flow::Port_space::m_recent_ephemeral_ports</a></div><div class="ttdeci">std::queue&lt; flow_port_t &gt; m_recent_ephemeral_ports</div><div class="ttdoc">A FIFO of recently used but currently available ephemeral ports.</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8hpp_source.html#l00243">port_space.hpp:243</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_ae4714945b23e588b1554240fa590560a"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#ae4714945b23e588b1554240fa590560a">flow::net_flow::Port_space::m_rnd_generator</a></div><div class="ttdeci">Random_generator m_rnd_generator</div><div class="ttdoc">Random number generator for picking ports.</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8hpp_source.html#l00246">port_space.hpp:246</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_aeafab53f020093121f5e57f1e692a9df"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#aeafab53f020093121f5e57f1e692a9df">flow::net_flow::Port_space::m_ephemeral_ports</a></div><div class="ttdeci">Bit_set m_ephemeral_ports</div><div class="ttdoc">Current ephemeral port set; indexing analogous to m_service_ports but starting at S_FIRST_EPHEMERAL_P...</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8hpp_source.html#l00219">port_space.hpp:219</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_af0c60ec4732021d52a19e5d2f6dc8b35"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#af0c60ec4732021d52a19e5d2f6dc8b35">flow::net_flow::Port_space::S_NUM_PORTS</a></div><div class="ttdeci">static const size_t S_NUM_PORTS</div><div class="ttdoc">Total number of ports in the port space, including S_PORT_ANY.</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8hpp_source.html#l00099">port_space.hpp:99</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_af4690f25a42ebb61561f91c9187bcc30"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#af4690f25a42ebb61561f91c9187bcc30">flow::net_flow::Port_space::Random_generator</a></div><div class="ttdeci">util::Rnd_gen_uniform_range_base::Random_generator Random_generator</div><div class="ttdoc">Random number generator.</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8hpp_source.html#l00167">port_space.hpp:167</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Port__space_html_afb17ac5ea9708262d0c374dc246a7244"><div class="ttname"><a href="classflow_1_1net__flow_1_1Port__space.html#afb17ac5ea9708262d0c374dc246a7244">flow::net_flow::Port_space::flow_port_sans_overflow_t</a></div><div class="ttdeci">uint32_t flow_port_sans_overflow_t</div><div class="ttdoc">A type same as flow_port_t but larger, useful when doing arithmetic that might hit overflow in corner...</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8hpp_source.html#l00170">port_space.hpp:170</a></div></div>
<div class="ttc" id="aerror_2error_8hpp_html_ab6b8ed79012c994cfc381e0b92c066fd"><div class="ttname"><a href="error_2error_8hpp.html#ab6b8ed79012c994cfc381e0b92c066fd">FLOW_ERROR_EMIT_ERROR</a></div><div class="ttdeci">#define FLOW_ERROR_EMIT_ERROR(ARG_val)</div><div class="ttdoc">Sets *err_code to ARG_val and logs a warning about the error using FLOW_LOG_WARNING().</div><div class="ttdef"><b>Definition:</b> <a href="error_2error_8hpp_source.html#l00202">error.hpp:202</a></div></div>
<div class="ttc" id="alog_8hpp_html_a325fdd4b5cf0be49b37d3b7b7c29070d"><div class="ttname"><a href="log_8hpp.html#a325fdd4b5cf0be49b37d3b7b7c29070d">FLOW_LOG_INFO</a></div><div class="ttdeci">#define FLOW_LOG_INFO(ARG_stream_fragment)</div><div class="ttdoc">Logs an INFO message into flow::log::Logger *get_logger() with flow::log::Component get_log_component...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l00197">log.hpp:197</a></div></div>
<div class="ttc" id="alog_8hpp_html_affcf2e4c496ce3f42adf981669c623b8"><div class="ttname"><a href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a></div><div class="ttdeci">#define FLOW_LOG_TRACE(ARG_stream_fragment)</div><div class="ttdoc">Logs a TRACE message into flow::log::Logger *get_logger() with flow::log::Component get_log_component...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l00227">log.hpp:227</a></div></div>
<div class="ttc" id="anamespaceflow_1_1net__flow_1_1error_html_a18e13de77b119ea0f2be411490859482a0eac39cc62ef841927a2f69a3c04db4e"><div class="ttname"><a href="namespaceflow_1_1net__flow_1_1error.html#a18e13de77b119ea0f2be411490859482a0eac39cc62ef841927a2f69a3c04db4e">flow::net_flow::error::Code::S_INTERNAL_ERROR_PORT_NOT_TAKEN</a></div><div class="ttdeci">@ S_INTERNAL_ERROR_PORT_NOT_TAKEN</div><div class="ttdoc">Internal error: Tried to return Flow port which had not been reserved.</div></div>
<div class="ttc" id="anamespaceflow_1_1net__flow_1_1error_html_a18e13de77b119ea0f2be411490859482a1975df7ed76c42660cbdc6039d5c70c5"><div class="ttname"><a href="namespaceflow_1_1net__flow_1_1error.html#a18e13de77b119ea0f2be411490859482a1975df7ed76c42660cbdc6039d5c70c5">flow::net_flow::error::Code::S_OUT_OF_PORTS</a></div><div class="ttdeci">@ S_OUT_OF_PORTS</div><div class="ttdoc">No more ephemeral Flow ports available.</div></div>
<div class="ttc" id="anamespaceflow_1_1net__flow_1_1error_html_a18e13de77b119ea0f2be411490859482a2c42b01b60ebe4834e9be3933ce94cb6"><div class="ttname"><a href="namespaceflow_1_1net__flow_1_1error.html#a18e13de77b119ea0f2be411490859482a2c42b01b60ebe4834e9be3933ce94cb6">flow::net_flow::error::Code::S_PORT_TAKEN</a></div><div class="ttdeci">@ S_PORT_TAKEN</div><div class="ttdoc">Flow port already reserved.</div></div>
<div class="ttc" id="anamespaceflow_1_1net__flow_1_1error_html_a18e13de77b119ea0f2be411490859482abb79e941df00b67a8631a9361ee5a4d1"><div class="ttname"><a href="namespaceflow_1_1net__flow_1_1error.html#a18e13de77b119ea0f2be411490859482abb79e941df00b67a8631a9361ee5a4d1">flow::net_flow::error::Code::S_INVALID_SERVICE_PORT_NUMBER</a></div><div class="ttdeci">@ S_INVALID_SERVICE_PORT_NUMBER</div><div class="ttdoc">Flow port number is not in the valid service port number range.</div></div>
<div class="ttc" id="anamespaceflow_1_1net__flow_html"><div class="ttname"><a href="namespaceflow_1_1net__flow.html">flow::net_flow</a></div><div class="ttdoc">Flow module containing the API and implementation of the Flow network protocol, a TCP-inspired stream...</div><div class="ttdef"><b>Definition:</b> <a href="asio_2node_8cpp_source.html#l00024">node.cpp:25</a></div></div>
<div class="ttc" id="anamespaceflow_1_1net__flow_html_a079d8cd87a68d1c5f04c6bce71f0061d"><div class="ttname"><a href="namespaceflow_1_1net__flow.html#a079d8cd87a68d1c5f04c6bce71f0061d">flow::net_flow::flow_port_t</a></div><div class="ttdeci">uint16_t flow_port_t</div><div class="ttdoc">Logical Flow port type (analogous to a UDP/TCP port in spirit but in no way relevant to UDP/TCP).</div><div class="ttdef"><b>Definition:</b> <a href="net__flow__fwd_8hpp_source.html#l00054">net_flow_fwd.hpp:54</a></div></div>
<div class="ttc" id="anamespaceflow_1_1net__flow_html_a9dd0c9d8de00fab78d8b0a3f50dad2a9"><div class="ttname"><a href="namespaceflow_1_1net__flow.html#a9dd0c9d8de00fab78d8b0a3f50dad2a9">flow::net_flow::S_PORT_ANY</a></div><div class="ttdeci">const flow_port_t S_PORT_ANY</div><div class="ttdoc">Special Flow port value used to indicate &quot;invalid port&quot; or &quot;please pick a random available ephemeral ...</div><div class="ttdef"><b>Definition:</b> <a href="port__space_8cpp_source.html#l00033">port_space.cpp:33</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a024ddda9acb2b66f2a1b35cdb0c016aa"><div class="ttname"><a href="namespaceflow_1_1util.html#a024ddda9acb2b66f2a1b35cdb0c016aa">flow::util::in_closed_open_range</a></div><div class="ttdeci">bool in_closed_open_range(T const &amp;min_val, T const &amp;val, T const &amp;max_val)</div><div class="ttdoc">Returns true if and only if the given value is within the given range, given as a [low,...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00287">util.hpp:287</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_ad92ad411feccf73908abe6ed130d48f5"><div class="ttname"><a href="namespaceflow_1_1util.html#ad92ad411feccf73908abe6ed130d48f5">flow::util::time_since_posix_epoch</a></div><div class="ttdeci">boost::chrono::microseconds time_since_posix_epoch()</div><div class="ttdoc">Get the current POSIX (Unix) time as a duration from the Epoch time point.</div><div class="ttdef"><b>Definition:</b> <a href="util_8cpp_source.html#l00147">util.cpp:147</a></div></div>
<div class="ttc" id="anamespaceflow_html_a29eaaa9d0fac4ce87d8b969222dbed09"><div class="ttname"><a href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">flow::Error_code</a></div><div class="ttdeci">boost::system::error_code Error_code</div><div class="ttdoc">Short-hand for a boost.system error code (which basically encapsulates an integer/enum error code and...</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00508">common.hpp:508</a></div></div>
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